Effect of Mesh Size and Hanging Ratio Gillnet to the Local Marketable Size of Giant Trevally Caranx ignobilis

Abstract

Gillnets are widely used by small-scale fishermen to catch giant travelly Caranx ignobilis in coastal waters, the dominant fish caught are small in size not according to market size. The parameters of gillnet such as mesh size and hanging ratio can optimize the target size. The purpose of this study was to analyze the effect of mesh size and hanging ratio of gillnets on the size of the local marketable size for C ignobilis. The fishing experiment was carried out in floating net cages at the Ambon Fisheries Training and Extension Center (BPPP) from June to August 2022. A Simple randomized experimental designed with a factorial pattern was used as the experimental model. The different mesh size were used as treatments, and they are 2.5, 3.0 and 3.5 inches (3 factors) and the hanging ratio consisted of 70%, 50% and 30% (3 factors). The population of C ignobilis that was used in this study with the middle of the class ranged from 24.5 to 29.5 cm total length. There is an effect of mesh size factor on the size of the target market for C ignobilis, where the mesh size of 3.0 inches is more effective than the others. In addition, the hanging ratio value affects the catch size of the local target market, where the hanging ratio value of 30% is more effective than the hanging ratio value of 70%. .